How to extend fuelpump life

It sounds like the fuel pump is going bad. If you had a fuel pressure tester you could check dead head pressure with the vehicle off and in the run position. A good operating pressure is about 41psi estimation. If you see the pressure drop right away and does not hold the pressure then the check ball or fuel pressure regulator is bad and you need to check those. Im giving proper diagonis procedures before buying somethimg you dont need. You can check a fuel pressure regulator with applying a vacuum to the valve and if the valve diaphragm holds pressure then it is good. Then all you have left is a bad checkball inside the fuel pump assembly. Unfortunately, if the ball valve is bad the whole fuelpump needs replaced. If you replace the assembly replace the filters too. A good tip to save the life of fuelpumps is to never allow the tank to run below a quarter tank because the fuel acts as a cooling system for the pump.

When you replaced the battery did you clean the terminals. Make sure the terminals are tight. Maybe your starter motor is on the way out

If your Tahoe is the 5.3 Non flex fuel then its in the gas tank then you dont replace it.
It's supposed to last the life of the Tahoe.
If your Tahoe is the 5.3 flex then the fuel filter is located on the under carriage of the frame and should be replaced every 15,000 miles.

Yes it needs to be replaced its already time for that.
IntervalsHere is what I recommend for maintenance intervals. There are exceptions to all of these including severe duty, which most northern cars fall into.

• Change Transmission filter-30,000 miles, 90,000 and 150,000 miles and fluid at 60,000, 120,000 and 180,000 miles.
• Change oil every 3,000 miles or 3 months, unless you use Mobil One, in which case 6 months/6,000 miles.
• Chassis lube every 3,000 miles, assuming there are fittings.
• Spark plugs: Conventional plugs: 30,000 miles, Double platinum: every 50,000 miles (100,000 mile plugs are best to be changed well before that, although some can reach it).
• Fuel filter: 35,000-40,000 miles. Unless it is in the tank. But if the tank is ever dropped, do it then
• Ignition cap, rotor, wires: 60,000-80,000 miles. (if it has them).
• Timing Belt, if applicible: 60,000 miles on many but check with gates or dayco or the manual or dealer, as many different intervals are now present.
• Coolant flush -- green: 2 years/24,000 miles.
• Coolant flush -- dex-cool or long life: 5 years/50,000 miles.
• Tire rotation: 5,000-8,000 miles.
• Alignment: 15,000-20,000 miles., unless tire wear is not a problem and car goes straight.
• Brake fluid flush and power steering fluid flush: 2 years or when dirty or discolored.
• Air filter, pcv valve and cabin air filter: as needed.
• Professional fuel injection service: 40,000 miles.
• Throttle bore plate cleaning: 20,000 miles.
• Air induction service: 20,000 miles.

MaintenanceEvery auto manufacturer lists their required maintenance on their web sites and in the owners manual the maintenance service intervals vary between manufacturers.

Your car is a moving piece of machinery, it needs maintenance, if you want this car to last you need to service it. Do not just do the minimum recommended services that are listed in you service manual. Make sure you service your cooling system which prolongs the life of the radiator and water pump, and the power steering system, which will extend the life of your cars power-seeking pump and gear box or rack. It will cost you much more than you want to spend when you fail to maintain your car and larger problems surface. I recommend that you review your owners manual and get acquainted with a reputable auto repair facility. A good relationship with you car and your car's mechanic will benefit you in the long run, providing you with a long lasting and safe car.

At 30,000 miles you should also service your cooling system, transmission, fuel system and power steering; this should be repeated every 30k miles. I recommend flushes of the later mentioned items to prolong these systems' life span.

There may be a good chance that the fuel filter has reached the end of it's life and needs to be replaced. The fuel filter should be replaced every 15,000 miles or once a year to ensure that it does not get to dirty and restrict the fuel flow to the fuel injectors. Start with this simple thing to do which is the common cause of engine stalling. Good luck and keep me posted, be glad to answer any more questions you may have. Auto Zone will have the fuel filter and the step by step instructions for you to replace the fuel filter.